Lenovo Yoga Ultrabook SSD Tweaks

My Lenovo Yoga 2 Pro 13 is a wonderful machine and I want to take care of the solid state device a.k.a. “hard-drive”. Basically I want to reduce unnecessary writes, for example by configuring the tmp dir to reside in memory.

System used: Grub | Linux | GNU | Debian | Ubuntu

Ignore Access Time

Use the noatime flag to tell the OS not to update the journal access time for files or directories.

/etc/fstab:

# file system    mp type options                   dump pass
UUID=2b386f58-4a /  ext4 errors=remount-ro,noatime  0    1

Memory Disk

Things that do a lot of writes but can be thrown away at shutdown are good candidates for memory disks.

Temporary Files

House temporary files in memory so we don’t waste writes to the SSD.

/etc/fstab:

# fsys  mount point  type   options                     dump pass
tmpfs   /tmp         tmpfs  defaults,noatime,mode=1777   0    0
tmpfs   /var/spool   tmpfs  defaults,noatime,mode=1777   0    0

Browser cache

Also browser cache can go in memory since its a heavy writer. I just did Chromium since that’s mainly what I use. All I do is just create a link.

mkdir -p /tmp/stav/cache/chromium
rm -rf ~/.cache/chromium
ln -s /tmp/stav/cache/chromium ~/.cache/chromium

/et/rc.local:

for user in stav; do
  DIR=/tmp/$user/cache/chromium
  sudo -u $user -- sh -c "mkdir -p $DIR && chmod -R 700 /tmp/$user"
done

Scheduler

Make sure we are using deadline, not cfq.

/sys/block/sda/queue/scheduler:

noop [deadline] cfq

/etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash elevator=deadline"

Then update Grub:

sudo update-grub2

Swap

/etc/sysctl.conf:

# Sharply reduce swap inclination
vm.swappiness=0

# Improve cache management
vm.vfs_cache_pressure=50

TRIM

Ubuntu already comes with a weekly cron job to trim discarded blocks: /etc/cron.weekly/fstrim. It is not advised to use “discard” in fstab because it can result in performance issues when deleting a large number of small files.

Notes

Reserve 10% SSD unallocated for over-provisioning

Do NOT enable hibernation

Windows: Dual boot? De-fragmentation will kill your SSD because of the many write actions that it causes.

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